Joke
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Time flies like an arrow.
Fruit flies like a banana.
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This is a well-known example of antanaclasis, a little more interesting than a mere joke:
https://en.wikipedia.org/wiki/AntanaclasisFor those that didn't get the joke:
https://en.wikipedia.org/wiki/Time_flies_like_an_arrow;_fruit_flies_like_a_banana--